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Title: Rotator cuff tendinopathy alters the muscle activity onset and kinematics of scapula
Authors: Leong, HT 
Ng, GYF 
Chan, SC 
Fu, SN 
Keywords: Scapular kinematics
Activity onset
Scapular muscles
Rotator cuff tendinopathy
Overhead athletes
Issue Date: 2017
Publisher: Elsevier
Source: Journal of electromyography and kinesiology, 2017, v. 35, p. 40-46 How to cite?
Journal: Journal of electromyography and kinesiology 
Abstract: Athletes with rotator cuff (RC) tendinopathy demonstrate an aberrant pattern of scapular motion which might relate to deficits in the scapular muscles. This study aimed to determine whether alteration in scapular kinematics is associated with deficits in the activity onset of scapular muscles. Forty-three male volleyball players (17 asymptomatic and 26 with RC tendinopathy) joined the study. Three-dimensional scapular kinematics was quantified using an acromial marker cluster method. The activity onset of the upper (UT), middle (MT), and lower trapezius (LT), and serratus anterior (SA) during arm abduction was assessed with electromyography. Athletes with RC tendinopathy demonstrated less scapular upward rotation (6.6 +/- 2.3 vs. 8.2 +/- 1.1 degrees, p = 0.021) in the early phase of shoulder abduction from 0 degrees to 30 degrees when compared to asymptomatic athletes. The tendinopathy group had delayed activity onset of LT (14.1 +/- 31.4 ms vs. 74.4 +/- 45.1 ms, p < 0.001) and SA (- 44.9 +/- 26.0 ms vs. 23.0 +/- 25.2 ms, p < 0.001) relative to UT when compared to the asymptomatic group. In asymptomatic athletes, earlier activity onset of MT and LT relative to UT was associated with more scapular upward rotation during 0-30 degrees of abduction (r = 0.665, p = 0.021) and 30-60 degrees of abduction (r = 0.680, p = 0.015), respectively. Our findings showed the control of the scapular upward rotation is related to the activity onset of the scapular muscles in athletes.
ISSN: 1050-6411
EISSN: 1873-5711
DOI: 10.1016/j.jelekin.2017.05.009
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